1
Gerald P Labedz, Jeffrey D Bonta, Dennis R Schaeffer, Daniel F Tell: Cellular voice and data radiotelephone system. Motorola, Raymond A Jenski, Rolland R Hackbart, March 31, 1987: US04654867 (209 worldwide citation)

A data message transmission system for a cellular radiotelephone system is disclosed. Data to be transmitted is converted into a format compatible with radio transmission prior to transmission. The data is reconverted to its original format following reception. Handoff is accomplished by halting the ...


2
Dennis R Schaeffer, Michael D Kotzin: Multiple user spread-spectrum communication system. Motorola, Raymond J Warren, May 11, 1993: US05210771 (116 worldwide citation)

A communication system having a site employing a plurality of communication channels. Each channel is assigned a desired received signal strength threshold. A channel is assigned to a subscriber unit based upon the strength of the signal received at the site and the power control range of the subscr ...


3
Dennis R Schaeffer: Cellular radiotelephone communications system. Motorola, Kenneth W Bolvin, December 17, 1991: US05073971 (82 worldwide citation)

A cellular radiotelephone communications system comprising a system of cells that are made up of an array of diretional sector antennas. These antennas are centrally located in the cell and radiates into a 60.degree. area of the cell. Each antenna in a cell has a group of frequencies assigned to it ...


4
Dennis R Schaeffer: Hopped-carrier dynamic frequency reuse. Motorola, Raymond J Warren, F John Motsinger, October 26, 1993: US05257398 (63 worldwide citation)

In a cellular radiotelephone network, there is provided a mechanism for dynamic frequency reuse. It comprises: allocating according to one reuse pattern during one time interval at least one of a plurality of hopped carriers and allocating according to another reuse pattern during another, substanti ...


5
Barry J Menich, Daniel R Tayloe, Dennis R Schaeffer, Victor Graziano, Valy Lev: Scanning receiver allocation method and apparatus for cellular radiotelephone systems. Motorola, Raymond A Jenski, Rolland R Hackbart, February 16, 1988: US04726050 (60 worldwide citation)

A method and apparatus for utilizing voice channel transceivers as temporary scanning receivers in a handoff event for a cellular radiotelephone system is disclosed. Voice channel transceiver identifications are stored in link lists according to priority, sectorization, and last use. When a signal s ...


6
Dennis R Schaeffer, Mark T Ahlenius: Communication system resource allocation method. Motorola, Anthony G Sitko, October 3, 1995: US05455821 (59 worldwide citation)

A method of allocating communication resources in a communication system includes retrieving (404) from the communication system a communication system resource allocation. An allocation parameter is set to an initial value (406) and communication resources are randomly selected from cells (414). A ...


7
Dennis R Schaeffer: Reuse groups for scan monitoring in digital cellular systems. Motorola, F John Motsinger, Rolland R Hackbart, Anthony J Sarli, September 12, 1989: US04866710 (54 worldwide citation)

An improved TDMA radiotelephone cellular communication system employs an improved cell site scan monitoring technique. The technique includes monitoring radiotelephone calls, and tracking and recording their signal qualities. The records are used to maintain and determine which frequencies and which ...


8
Kenneth A Felix, Dennis R Schaeffer, Jeffrey D Bonta: Cellular radiotelephone system having colocated base sites. Motorola, Rolland R Hackbart, October 4, 1988: US04775998 (52 worldwide citation)

A cellular radiotelephone system (101) includes a control terminal (420) coupled by in trunks and out trunks to the telephone central office (110) and by data and voice lines to base sites (411-416) in corresponding cells (401-406) for providing telephone coverage to mobiles located throughout a geo ...


9
Mark T Ahlenius, Dennis R Schaeffer: Method of topographically displaying selected information in a cellular communication system. Motorola, Anthony G Sitko, February 6, 1996: US05490285 (40 worldwide citation)

A method is provided of topographically displaying selected information of a plurality of cells within a cellular communication system through a display device. The method includes the steps of accessing the selected information from an information database and correlating the selected information t ...


10
Jeffrey D Bonta, Barry J Menich, Dennis R Schaeffer, Edward J Hofstra: VOX remote unit control in a cellular system. Motorola, Raymond A Jenski, Rolland R Hackbart, Donald B Southard, June 14, 1988: US04751725 (32 worldwide citation)

A cellular radiotelephone system providing service to remote units having a voice operated transmitter (VOX) is disclosed. If the regularly scheduled periodic signal quality measurements made by fixed site equipment indicate that the remote unit signal has not been received for a predetermined numbe ...